Sound-box.



Patented Nov.l I8, |902.

W. VAN Z. P. BRADLEY.

S0 U N D B 0 X.

(Application filed June 27', 1902.)

(No Model.)

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UNTTnn STATns VPATENT OFFICE.

IVINAN'I VAN ZANT PEAROE BRADLEY, OF TOLEDO, OHIO.

SOUND-BOX.

SPECIFICATION forming part or" Letters Patent No. 713,592, dated November 18, 1902.

Application filed June 27, 1902. Serial No. 113,442. (No model.)

lo all whom, it puny concern:

Be it known that I, WINANT VAN ZANT PEARcn BRADLEY, a resident of Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Sound-Boxes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to the part of talking-machines commonly called the soundbox.7 The main object of the invention is to simplify and improve such sound-boxes.

In the drawings, Figure l is a plan viev7 of the sound-box. Fig. 2 is a sectional view on line 2 2. Fig. 3 is a side view of the soundbox, and Fig. 4 is a partial section showing a modification.

l indicates the sound-box; 2, the acoustic diaphragm, preferably of mica; 3, an elastic packing, as a rubber ring, around the edge of the diaphragm, the diaphragm and rubber ring fitting into the sound-box and resting against shoulder 4. Within the sound-box outside of the diaphragm is a spring-wire ring b', divided at one point, as at 7, and when in place is compressed, Wherebyit is given sufficient elasticity to hold it in place against the diaphragm by the pressure of the spring against the smooth plain inner surface ofthe sound-box. It is not essential, however, that said inner surface be smooth or that it be plain. As shown inr Fig. 2, said surface may be provided with a depression 8, which will assist in holding the ring in place.

The rim of the sound-box is provided with a notch 9, extending nearly to the diaphragm. Supportedin said notch by apin 10in ahole in a wall of the box is a block 1l, carrying the spring l2, which rests on the diaphragm at its center, preferably on a pellet of adhesive inaterial. 13 is a screw for fastening pin l0 in any position to which it is adjusted. By adjusting said pin, and thereby the pressure of spring 12 on the diaphragm, the tone of the sound-box can be conveniently varied.

l/Vhen inserting spring-ring 6, the division 7 is placed radially in line with the notch in the sound-box. Hence it does not interfere with the block 11, which block is provided with a hole to receive a reproducing-point and a fastening-screw therefor in well-known manner.

I am aware that a body carrying an operating-point having a part bearing on the center of the diaphragm and a part adapted to be secured to the sound-box on the outside thereof by a screw and elongated-slot connection has heretofore been proposed. My invention, however, relates to my novel and useful improvements.

I claiml. The combination of a sound-box for talking-machines, said box having a rim, there being a notch in the rim, a reproducing-pointcarrying body supported in the notch, a spring also carried by said body and pressing on the diaphragm, and a spring-ring in the box over the diaphragm to hold it, the spring-ring be'- ing divided at the part corresponding to the said notch in the rim.

2. The combination of asound-box for talking-machines, a diaphragm therein, a reproducing-point-carrying body, a spring carried by said body and pressing on the diaphragm, a pin extending from said body into a hole in the box, a lock-screw at an angle to the pin and adapted to lock the pin in any adjusted position, whereby the sound of the box may be varied by such adjustment.

3. The combination of a sound-box for talking-machines, a diaphragm therein, a reproducing-point-carrying body, a spring carried by said body and pressing on the diaphragm, a hole in the end of the sound-box, a pin extending from the rear side of said body inside of the periphery of the box and extending into said hole in the end of the box, and a lock-screw at an angle to the pin and adapted to lock the pin in adjusted position.

In testimony whereof I have signed this specication in the presence of two subscribing witnesses.

WINANT VAN ZANT PEARCE BRADLEY.

Vitnesscs:

CLEM V. WAGNER, L. n. WILLIAMSON. 

